1 // Copyright 2012 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
11 func (c *packetHandler) readFrom(b []byte) (h *Header, p []byte, cm *ControlMessage, err error) {
13 oob := NewControlMessage(c.rawOpt.cflags)
15 n, nn, _, src, err := c.ReadMsgIP(b, oob)
17 return nil, nil, nil, err
20 if hs, p, err = slicePacket(b[:n]); err != nil {
21 return nil, nil, nil, err
23 if h, err = ParseHeader(hs); err != nil {
24 return nil, nil, nil, err
27 cm = new(ControlMessage)
28 if err := cm.Parse(oob[:nn]); err != nil {
29 return nil, nil, nil, err
32 if src != nil && cm != nil {
38 func (c *packetHandler) writeTo(h *Header, p []byte, cm *ControlMessage) error {
40 wh, err := h.Marshal()
44 dst := new(net.IPAddr)
46 if ip := cm.Dst.To4(); ip != nil {
54 _, _, err = c.WriteMsgIP(wh, oob, dst)